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Power storage device

battery technology, applied in cell components, electrochemical generators, transportation and packaging, etc., can solve the problems of reduced reaction amount between silicon and carrier ions, reduced charge/discharge capacity, and difficulty in charging/discharging at high speed in a power storage device, so as to improve the yield of the assembly to manufacture the battery, improve the mechanical strength, and improve the effect of mechanical strength

Inactive Publication Date: 2013-03-21
SEMICON ENERGY LAB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a power storage device that has high charge capacity and discharge capacity, and can perform charge / discharge at high speeds with minimal deterioration in battery characteristics. This is achieved by using a graphene layer that reduces the amount of carrier ions transferred between an electrolyte and a layer formed using silicon, resulting in a reduction in reaction between silicon and carrier ions and a reduction in charge / discharge capacity. Additionally, by using a graphene layer that prevents expansion and contraction of the volume of particles of an active material due to repeated charge / discharge, pulverization of the particles is minimized.

Problems solved by technology

Consequently, the amount of reaction between silicon and carrier ions is reduced, which causes a reduction in charge / discharge capacity and makes it difficult to perform charge / discharge at high speed in a power storage device.
In addition, even when particles of an active material are covered with a graphene, it is difficult to suppress expansion and contraction of the volume of the particles of the active material owing to repeating charge / discharge and to suppress pulverization of the particles of the active material due to the expansion and the contraction.

Method used

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Examples

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embodiment 1

[0070]In this embodiment, a structure of a negative electrode of a power storage device which is less deteriorated through charge / discharge and has excellent charge / discharge cycle characteristics and a manufacturing method thereof will be described with reference to FIGS. 1A to 1C, FIGS. 2A to 2D, FIGS. 3A to 3D, FIGS. 4A to 4C, FIGS. 5A to 5D, and FIGS. 6A to 6C.

[0071]FIG. 1A is a cross-sectional view of a negative electrode 206. The negative electrode 206 functions as an active material.

[0072]Note that an active material refers to a material that relates to occlusion and release of carrier ions. An active material layer contains, in addition to the active material, one or more of a conductive additive, a binder, a graphene, and the like. Thus, the active material and the active material layer are distinguished from each other.

[0073]A secondary battery in which lithium ions are used as carrier ions is referred to as a lithium-ion secondary battery. As examples of carrier ions whic...

embodiment 2

[0125]In this embodiment, a negative electrode having a structure different from that of Embodiment 1 and a method for manufacturing the negative electrode will be described with reference to FIGS. 5A to 5D and FIGS. 6A to 6C. The negative electrode described in this embodiment is different from that of Embodiment 1 in that a current collector is provided.

[0126]FIG. 5A is a cross-sectional view of a negative electrode 216. In the negative electrode 216, an active material layer 215 is provided over a current collector 211.

[0127]A specific structure of the negative electrode 216 will be described with reference to FIGS. 5B to 5D. Typical examples of the active material layer 215 included in the negative electrode 216 are an active material layer 215a, an active material layer 215b, and an active material layer 215c in FIGS. 5B, 5C, and 5D, respectively.

[0128]FIG. 5B is an enlarged cross-sectional view of the current collector 211 and the active material layer 215a. The active materia...

embodiment 3

[0150]In this embodiment, a negative electrode having a structure different from those of Embodiments 1 and 2 and a method for manufacturing the negative electrode will be described with reference to FIGS. 7A to 7C, FIGS. 8A to 8D, FIGS. 9A to 9D, FIGS. 10A to 10C, and FIGS. 11A and 11B.

[0151]FIG. 7A is a cross-sectional view of a negative electrode 266. The negative electrode 266 functions as an active material.

[0152]A specific structure of the negative electrode 266 will be described with reference to FIGS. 7B and 7C. Typical examples of the negative electrode 266 are a negative electrode 266a and a negative electrode 266b in FIGS. 7B and 7C, respectively.

[0153]FIG. 7B is an enlarged cross-sectional view of the negative electrode 266a. The negative electrode 266a includes an active material 262 and a graphene 264 provided over the active material 262. The active material 262 includes a common portion 262a and a plurality of protrusions 262b which protrude from the common portion 2...

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Abstract

A power storage device which has high charge / discharge capacity and less deterioration in battery characteristics due to charge / discharge and can perform charge / discharge at high speed is provided. A power storage device includes a negative electrode. The negative electrode includes a current collector and an active material layer provided over the current collector. The active material layer includes a plurality of protrusions protruding from the current collector and a graphene provided over the plurality of protrusions. Axes of the plurality of protrusions are oriented in the same direction. A common portion may be provided between the current collector and the plurality of protrusions.

Description

TECHNICAL FIELD[0001]The present invention relates to a power storage device and a method for manufacturing the power storage device.BACKGROUND ART[0002]In recent years, power storage devices such as lithium-ion secondary batteries, lithium-ion capacitors, and air cells have been developed.[0003]An electrode for the power storage device is manufactured by providing an active material over a surface of a current collector. As a negative electrode active material, a material which can occlude and release ions functioning as carriers (hereinafter referred to as carrier ions), such as carbon or silicon, is used. For example, silicon or phosphorus-doped silicon can occlude about four times as many carrier ions as carbon and thus has higher theoretical capacity than carbon and is advantageous in increasing the capacity of the power storage device.[0004]However, when the amount of carrier ions which are occluded is increased, the volume of an active material greatly changes in accordance w...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/583H01M8/22H01M4/64B82Y30/00B82Y99/00H01M4/133H01M4/134
CPCB82Y30/00H01M4/134H01M4/1395H01M4/366H01M4/133H01M4/625H01M10/0525H01M10/465Y02E60/122H01M4/386Y02E60/10Y02T10/70
Inventor TAJIMA, RYOTAYAMAZAKI, SHUNPEIOGUNI, TEPPEIOSADA, TAKESHISASAGAWA, SHINYAKURIKI, KAZUTAKA
Owner SEMICON ENERGY LAB CO LTD
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